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All Journal Journal of Natural Sciences and Mathematics Research Jurnal Geosains dan Teknologi
Restiana, Andini
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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Identifikasi Sistem Panasbumi Hu’u Daha Kabupaten Dompu, Nusa Tenggara Barat Menggunakan Pemodelan 3D Inversi Metode Gravitasi, Analisis Derivative dan Land Surface Temperature Restiana, Andini; Sari, Feby Puspita; Fadrian, Dhika Faiz; Anjali, Delia; Firmansyah, Aep
Jurnal Geosains dan Teknologi Vol 6, No 2 (2023): Juli 2023
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.6.2.2023.90-103

Abstract

Ketergantungan pada energi fosil terus meningkat seiring dengan meningkatnya tuntutan kehidupan. Oleh karena itu, ketergantungan kita pada energi fosil perlu dialihkan dengan menggunakan energi panasbumi. Salah satu daerah prospek panasbumi di Kabupaten Dompu, Provinsi Nusa Tenggara Barat adalah Hu’u Daha 35 km di sebelah timur Kabupaten Dompu memiliki potensi terduga ±69 MW. Penelitian lebih lanjut dilakukan pada sistem panasbumi Hu’u Daha melalui korelasi analisis peta Land Surface Temperature (LST), analisis derivative, dan pemodelan inversi 3D sehingga dapat diketahui dugaan keterdapatan lapisan reservoir berupa batuan lava dan breksi berkomposisi andesit dan basalt serta sisipan batuan tufa dengan rerata kedalaman 633 – 1500 m dengan nilai densitas 3,4 - 3,33 gr/cm3 yang dilingkupi oleh lapisan cap rock berupa batuan lava hasil erupsi dengan kedalaman rata-rata 0 – 633 m dengan nilai densitas 3,51 – 3,44 gr/cm3, serta terdapat 11 patahan yang mengontrol sistem panasbumi berupa 2 strike-slip fault, 7 normal fault, dan 2 reverse fault. Berdasarkan analisis peta Land Surface Temperature (LST) yang di overlay dengan peta geologi dapat diketahui pula persebaran suhu permukaan daerah Hu’u Daha berkisar antara 26°C – 28,4°C. 
Geothermal potential analysis using 3d modeling of subsurface structures based on the Gravity Anomaly in the Mount Lawu area, Central Java Puspita Sari, Feby; Restiana, Andini; Firya Wardhianty, Nabila
Journal of Natural Sciences and Mathematics Research Vol. 9 No. 1 (2023): June
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

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Abstract

Over time, energy needs will continue to increase. Dependence on the use of fossil energy results in the availability of such energy will run out at any time, so it is necessary to develop research on geothermal energy that is environmentally friendly and renewable. One of the Geothermal Work areas is on Mount Lawu, located at coordinates between 111°15' east longitude and 7°30' south latitude in several districts Central Java Province and East Java Province. The purpose of this study is to provide information related to geothermal potential using the gravity method by knowing the temperature of the area and the 3D modeling of subsurface structures. Based on the results of the Second Vertical Derivative (SVD) analysis, three normal faults were found in geothermal sources. The modeling results show that the residual anomaly map depicts a distribution of high anomalies ranging between 2 mGal up to 6.5 mGal scattered from North to South and East to West, suspected to be caused by lava rock intrusion. The results of the 3D inversion model show there are three layers, namely clay rock, which is suspected to be cap rock at a depth of 500 - 2500 m, pyroclastic lava rock, which is suspected to be as a reservoir at a depth of 3000 - 4500 m, and lava, which is suspected to be as a reservoir heat source at a depth of 5000 - 8000 m. Based on the map in Land Surface Temperature (LST) obtained the temperature value of Mount Lawu ranging from 3.14 °C - to 23.25 °C.
Co-Authors Anjali, Delia Fadrian, Dhika Faiz Feby Puspita Sari, Feby Firmansyah, Aep Firya Wardhianty, Nabila Sari, Feby Puspita